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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72c24fb0ce3737b955b30712f860b8a8885046348189c8e730f30a7cd06812d' 
  AND token = 'RWzfsJkxbuOD8qg8qvbH65Er/0KErChxhGIVtKtTNaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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