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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfb806b8c5c183563c1cd2f4224a681ccea9b2d3c5d30431c53e9dbc80ae15a' 
  AND token = 'SuwcHkfgSEoHyxH8bs4WDBhfUyxsVyfczTa9JVVNrMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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