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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c97936654127037d76c05b8cfd4a766e7980571ecd0c71a2fc8764d7bfd9f8' 
  AND token = 'n07QcvX4YThRM4glcAA0mV4FbJKpSqmw7pXUh2eAg0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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