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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af0b2ae7016d5f2e83279556a7e6325dca71c24397f718d4c25758a3626d344' 
  AND token = 'ph9jZe+2ScSqJan4fGgjSZ1B4IvNOW6S7PNcbZBi6DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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