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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32550022c7668128bc5750ceedb407f1fe2a25ab930a6d9aad442959db145fcb' 
  AND token = 'P8veXjNZT8gkD/9AhbcaG/0vC2wtRJf0GP2WffFgMhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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