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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbdef40ff19df2c3d94297cd0baf07e86cc2374a752f62cb3e2a5c816f209af' 
  AND token = '83fgoOw0JUaElUPV34sT9c4Ban+BMh80Wxnc8ZXGAjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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