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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7c15911525413f50ac54da5343253a73f0ca842a88ac073cc29bc2fe842850' 
  AND token = '/eep95I9ucPdCDDspBPDUN8DO05+0Cp9p+P7bLDdAHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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