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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a00a85cabbceba59b52f155aff487a0abf282c2dac4b3b7b3a2f1a6830f73d4' 
  AND token = 'Sm8+ypK0YV40T8H4swuw48D6scdH6ImNVA5a8QVtsMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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