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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd9ed9adb7035c59d699f4cedbe1c7cf2c292e0126de9f3d206b94c5bb72b07' 
  AND token = 'wsVrVnj9qzu7wD1ugvc+HlgTX2pQ6YEsdmZiOWEaAWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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