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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b292f848b0b556422f89e6db57dec19c034552fc8c15800e2d23eb9129ad61c8' 
  AND token = 'c5drsTch0MxI3esq9r6nuLhWCrYj6a2D25nLCVJ9MlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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