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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e02a22ddcae15acbfe910f8c1de5fe6b5cc4e05c61cedf9692d0a2f75158383' 
  AND token = 'OfU7TtiX4PZCy1NT0O/2GMw1EdpoSj7PQZNlUn18T7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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