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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acaabdcf2afef52937ab1a0c09a63b7c24192d128f68e2dc18a85ca2f506f1cf' 
  AND token = 'q9NkoRGJQiFKUrvsnRP5Vii2o1wHYmVYaZA8gudqaBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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