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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27bc3708843c76061c10d68a008670b4a85a92d9333650d877f32ea537bc121a' 
  AND token = 'wuIEEnOeQUsTv/XQNtN3V/Xd5Wzt09IxVC5cO41fALA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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