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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bc11017217ce1dba5595a50f01276f3d6cb5cdc6d39abaa356d5c9549bb816' 
  AND token = 'lCCPFbTMY6/4XzlNgEf5QRh1/rv++KK6aTGQMQDnyys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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