SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d25c9e3577b650ffdab69995208d987df8bf7656a8687dc3cd40f9c6aa68fc8' 
  AND token = 'u1Oz6VRwJI/J6q5p5d3q1n+ZTYZXzNSrNoh3+hnpIGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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