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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4dbc3fde4c792f16c24ba6133f4849d39b9f95efaf765d4b331c9601ebf1192' 
  AND token = 'gyYb3M2HjQxxlZRiRJbAkfkjcAJ2+IYwvQvV0pi21B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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