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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56043191c695edc9a5c36b185928f873dd7a9e7f7fb1fa84101a397aff9d9dbd' 
  AND token = 'E0sk8t0aV9dx3rIADhooHEfieB0eqJuC2gYtrWskWYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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