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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f012798d14cb547ccb24d44e40409d6da71bd5d1e0d4c70be4fe2fe0a3b11932' 
  AND token = 'QAUisZoVFiqywQAwqDTk9+AvGf2nFDHm/dxKZuWikB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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