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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8532c417e33a7c53b7bf8bb5de2183beaa9a3d1528851477d231eac94d29ef2d' 
  AND token = 'zeh1FJrJrFoYu+RBXRuos85Dl2yQoCOiMp1/h+TYMJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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