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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c7f789681cd01ea880ce5a17dbde2311c598ed18e6bbe7cc90abcb77ba7dc3' 
  AND token = 'oZPXqSWbv7gDto/e7Sonu0hnv+ufc3x2Nf9TsU7ojvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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