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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b929af65125bf565a4a36b72d9a1caec2c994813a0e29dfe8eee81fec4a8a0d' 
  AND token = '4ywanzhWbjO/eQOE6EHdX7L8F0Rw4/mVF01/O6/qHK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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