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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802ab236751ed4c1906313673af37cf8c6d150da2abb689189108336d9abb3e1' 
  AND token = 'TJ+GNrFt12b/fk8DvPxu/rS5dDQlJKqCgwLENpU5HkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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