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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c902166e6d2798c2ca2027feb3e746685b01886f557f17a27d7e0aad9b8f800' 
  AND token = 'L5l9RQ0TvENp4ZuBy0SsiMtDjiEaOBu5W2TAgYI2JuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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