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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0342daa5d90603c8c10ced314ed5066661f33b14b34a3e5a485ed66e2cb24389' 
  AND token = 'QdIHEySlQRgRaC0bdSgbbDk6riAwCV7NmEg8E2gUCEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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