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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d48cb667f32501465a7e77749a4c0536bb2ac39e7a4c8cae1222c3e76a401ae' 
  AND token = 'EJsS5Aoe2chI5ONJZOZO4SjKRuJ5G1lk4/5ovAMYvUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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