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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e2cb2e2ed0b0de27a8af8d3789891878cbe3837fe2ea0f5490f5559d7625dc' 
  AND token = 'FFN7xiB8oOj8lLVZSLNngMauXgA3PvThY9lvprGdOgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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