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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d39f2b56bad1796feb59742ed6b82b07abef62da5d655c20f25d7b50d929a8' 
  AND token = 'iibFUcR2iaGKJuWgsGVgb1sPSPa6LoX3YRpv2euH5hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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