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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284de559a3bb0e816e37af48b5b18595b462ad93058dd17fced9571057cfaa35' 
  AND token = 'taq1+GFbDeC81MOfB8gjL/o+iOgnTtoDnnBFDaRSZjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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