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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff191577a06366caa0a1267bbf63c97c0d02b94f683693d59813ab317ef193be' 
  AND token = 'XakYqXBCDwu2WXuRp/Fw9wrvrF7+Nhlc/ykkoGxcymw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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