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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0917221c54cafb71c9aadde5b991175945a4b36dba4d3aa448ac9ab4181b7844' 
  AND token = 'IeNY5s841K4qjNJlpIr6qb3xkoO306MMZP0jD1JuI2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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