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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43fe34b9b5d98065d200b688e7ac7e412bb4658c03b2c62af0a32563aed2428d' 
  AND token = 'CZt7/1h44O8Fe2tOQsMXZW9ilysSwI5FIr+elmwfdMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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