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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2caf5e8f64c842d644f166a02cf7472949d0a6fa293e7d8ad977a09ae7aac8' 
  AND token = 'rZ6+QFh3R+1m65jTASOt+z8M0ejRSvOawqiOuMeoJVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}