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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc8882a58a65b8ee40e28fdaf9b0ef3cd9f6f3a7827d79a5971dbb2d27b9fe8' 
  AND token = 'ctkhSN5t8KnpvBYJgwdTSFkCu9BeQqEzrWrb/9evXvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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