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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b02156ab1a40ed7c747e142f4cc599af511a9efb7a35c538fcc0ca0f676e54' 
  AND token = 'Hh0NjvpZdZDiJNVIoiv08XQafh+oPUObh1MVOBfBJew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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