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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b4ed87dc29ae5e39c92cb26cad209ef83295cddeaf21ee448672ebe9d393f3' 
  AND token = 'F104Dz5Npp2ISux5LCYAZwLy8TFVMbVsH8VuN5S3zLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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