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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e5487341e8048f6aa169c3f5d9e69ffd7fccda01ddf3fcd8a64c81b8789aa6' 
  AND token = '5L4logL/NoSMTS86PN2qwbMlBZFjP8LCuxl4PxvVRC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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