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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af995eb3dafb35580dd9058d623af14be57b248c870e370bc70b0ce42286b7e' 
  AND token = 'anVGA9J4bN35Etn9SvJOt6NhMPohCQ1CJQqRmtsFWNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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