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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd93729d5edd3be9070d8ed5ce38969d1f913264f52793928d3a043d4ad0b0ca' 
  AND token = '4re2mRL0Qnk3GYnfRpws6M8HPFg0VWusG/gLwihyxRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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