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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b95014842c6281871ee5e7f71404936ca94603665ff5aaf01682c62ffdb5c9' 
  AND token = '/wMir+D/l3NgnEJDJK3ay/WmEoB9jLu7i7l4EPft5fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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