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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067fc46f3b1bb8558a8d7af674dadb716e5f90404b83ef8deed5ef06afde303c' 
  AND token = 'waiJT1bOZkGc+2/deXc7h0/YaGTescIgZb4VPz/ae/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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