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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bd737901c6ee99e44e51f8305cb55dae4b582ac9b9852b12b541019914790c' 
  AND token = 'QaRKhA8SnYQLsDT6z/H5KKsvwja2HDECO9kUQ2J+goA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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