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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9205b1297e9596f0f902ba606804a2cb16b4410146050defcc025d65ca3436a' 
  AND token = '1NV34Iko11WqZZEIrmU+CK2kQlme6oApbOt8w8gm+r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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