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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c13231e95b1dff3abf091d61497a19b1e8a8e40bc3d7512a42f39b61f048af' 
  AND token = 'QwWI6d8hCGqthdgHv6V2U3Sb6pu5zj1ynF7reRtnw0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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