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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023c2ed8c552cc48cb14074687fa412b1566234c5b9e2c9b8fdf82fcb9c3e7b7' 
  AND token = 'CjymlOvhfjGRlPyC3QF7fNLIhFIDtlRln4PLYe6PIYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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