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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8900186ccb1c3c804db36dc5009d90554fae6108f74d878387916c70b2c6ee6a' 
  AND token = 'fqTsX9RG1iikGwuCSmU/9IEPHkGR7Say7XxaHCb4x00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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