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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fed89b91d355de7881c8c5ea6d21cd009de354eaafded775f0677b9fc7915a' 
  AND token = '6XOssALckGb5TLeAZVmQQ1R5fsodPtYCZx37ijajUi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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