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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00edfa91103a139af8e2cdeaa6099684a304759f488335b61f7ff8dde320093' 
  AND token = 'RFTWB/eQQt97xUdPhHICnhuHmCU51F8D/VC+wT9/+WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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