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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093e241c6f144b5c56cb9e9dc6c9302ab5579cc60789fc92d91b2394a271d7fe' 
  AND token = 'scu10NJnmbXodwKXibfpONH/g3E0zQ9xxNmPSpaNUbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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