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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b7503f3aeffb82bcb973f71ee0608e85676fcc2fc84ede75589aa9d0c946c8' 
  AND token = '3yMOWi/kYChbL1FvPAOK1pBUYo248C6NBUbKn5N2Z+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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