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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efaf92a142f6232201da36ea231acd8f4235053d2c0a8566dac093b023c401ab' 
  AND token = 'wvGk3cXPGMoK1zO544Juso3b9jzmMRe6BczfjPP0o8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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