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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13eeb7043031d64d620964773748836547d5a6504460e9ebd8c518181fc4322' 
  AND token = 'AZj8v3PPomG75n6wdc0t98Swl9fHWcOlQSlT7v7jsYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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