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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28736b1948a2d774487c0ccaa01c779d94994e9b0d1fdef92e827f58d67ad1e9' 
  AND token = 'LSNhyPstrf1+ZsCnIMHsGjMPQSCz6iiU4M67N+ywM+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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