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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4fa7da217bdaed3b5e8fc4c2c2050d202fe0de75f90775106c9249eaf34946' 
  AND token = '2xXLtLnU7AgXZHMv0HRgjxM83Lb5gHey27seiY2n2z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00262

JSON explain

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