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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1667656b2f4b8a8f0c3dd1f905a9eebe6b1d14c80af1b3b8e296f54fe4a98e8f' 
  AND token = 'kBhO053BpbfKjonmUANQ7qpIKI4uf8rzsGWC6yE8594=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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