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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d8ff8769b429a3257dd846370a48323473430b3ca71227f2c720e5b29644da' 
  AND token = 'cMPbRwJi9EtM+Mv+JW1p9RH6akt99M7Gj6xATE44h+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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