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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370ad29835c912d9799bb4ce394175886e7d9640d5c8e89ee391992413a3c410' 
  AND token = '/UcSdV7I+F7q7kpLqPJbQdIpDuTi8exz7mPHuCNlgnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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