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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd6ef23aa08ef5af0e7c927bf796ee72c91bc533e4ada7d92047d5e6dcb2dd9' 
  AND token = '9qhCWCtlBLSvT7Pv8Y9Z6J3ilX5WbvtS9LLH/GXcRq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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