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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554b9e69256172225ce1a5940aacb74e57a834274980880ab97863eaa9ba0223' 
  AND token = 'oOZ6oQpgdrCIDftJvtn99RwRq4pl06QR9kxPyaOi/60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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