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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215c3e6ba20b4d2dc23e9c8e93453f4be809fdc3c6caf90cb43e7baaf7a34890' 
  AND token = 'Xe6dUZcmE+4IzIX5opmRM3sZ4tjrVsJSrEjl5WRWUhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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