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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e584f57f4b832854ebb016da3378db0d0447f05e860c6b0e55fd4d5e6e68529b' 
  AND token = 'hK7WvZtfdXKgqQSgvdjzYtqv5Lez9PUspi606DHgbXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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