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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc2fe8e4e63989c1959bdf27a52ca6e675adad06f79bc839ab33f1f43ef5797' 
  AND token = 'zVYLyXs6ceWISrRev3rJx3gHjvXWqjD0V9un43C8/3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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