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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9deba40669ecd3694ec8f93c2aca1ff72aaa46c2ad600764493eecf139c2cdc' 
  AND token = 'St9RmUMdeMEZyDL2y/qcSpZmY5t1JWEmaDB/tlhtEYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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