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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88dff6368875ccc6bc96b5bb1938f76a12ba9287aa3d72226d5352a299d1809a' 
  AND token = 'ebCWFPdaGjXJ02asOWe7M3j9g2ZyrVao0DM/qjdsteE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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