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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae15a4c51a2ec824886483aadfea6ce4d957293680f8deec3444e98a8edd24de' 
  AND token = 'k7EcHtzS+Q45LKKsXzLioLmiNstrhkx8upRxPYwPfWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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