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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd9eda2e744c8f8619ca830af7bc4edc6a343ac5c38441573152f28fea010f7' 
  AND token = 'XAczhmer8zAUq7D5WXJTP+zCDfU/nwlFgRZ5XhmT+eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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