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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86a7f1649671f5efc56ec830100fe677e6f9553f765fab80fdff4f6626ef12b' 
  AND token = 'MN4y4lsMLTBM78VdfVxzq0Ca//48bPFOmmjv5iKsN0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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