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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9af47aeac7ab76250c6a1d40a64b9b70788a57615a36e7c46939b580e3013b' 
  AND token = '+AJFJbeBAxlBM+cHVUahZ4WNDzhYd0+fVvuqyOL3V5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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